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Experimental validation of a diagnostic technique for tuning the fourth shock timing on National Ignition Facility

Source: Phys. Plasmas 17, 012703 (2010); doi:10.1063/1.3276154

Published 11 January 2010

KEYWORDS and PACS
Keywords
PACS
  • 52.70.-m
    Plasma diagnostic techniques and instrumentation
  • 52.65.-y
    Plasma simulation
  • 52.50.Lp
    Plasma production and heating by shock waves and compression
  • 52.35.Tc
    Shock waves and discontinuities in plasma
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef AIP
H. F. Robey,1 T. R. Boehly,2 R. E. Olson,3 A. Nikroo,4 P. M. Celliers,1 O. L. Landen,1 and D. D. Meyerhofer2
1Lawrence Livermore National Laboratory, Livermore, California 94550, USA
2Laboratory for Laser Energetics, Rochester, New York 14645, USA
3Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
4General Atomics, San Diego, California 92186, USA
Capsule implosions on the National Ignition Facility (NIF) [Lindl et al., Phys. Plasmas 11, 339 (2004)] will be driven with a carefully tailored sequence of four shock waves that must be timed to very high precision in order to keep the fuel on a low adiabat. The Hohlraum conditions present during the first three shocks allow for a very accurate and direct diagnosis of the strength and timing of each individual shock by velocity interferometry. Experimental validation of this diagnostic technique on the OMEGA Laser Facility [Boehly et al., Opt. Commun. 133, 495 (1997)] has been reported in [Boehly et al., Phys. Plasmas 16, 056302 (2009)]. The Hohlraum environment present during the launch and propagation of the final shock, by contrast, is much more severe and will not permit diagnosis by the same technique. A new, closely related technique has been proposed for measuring and tuning the strength and timing of the fourth shock. Experiments to test this technique under NIF-relevant conditions have also been performed on OMEGA. The result of these experiments and a comparison to numerical simulations is presented, validating this concept. ©2010 American Institute of Physics
History: Received 22 June 2009; accepted 31 August 2009; published 11 January 2010
Permalink: http://link.aip.org/link/?PHPAEN/17/012703/1

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